[py] Return HTTP response reason when remote connection error occurs (#15942)

* [py] Return HTTP response reason when remote connection error occurs

* [py] Remove f-string

Author: cgoldberg

py/selenium/webdriver/remote/remote_connection.py

@@ -437,10 +437,10 @@ def _request(self, method, url, body=None):
         try:
             if 300 <= statuscode < 304:
                 return self._request("GET", response.headers.get("location", None))
-            if 399 < statuscode <= 500:
-                if statuscode == 401:
-                    return {"status": statuscode, "value": "Authorization Required"}
-                return {"status": statuscode, "value": str(statuscode) if not data else data.strip()}
+            if statuscode == 401:
+                return {"status": statuscode, "value": "Authorization Required"}
+            if statuscode >= 400:
+                return {"status": statuscode, "value": response.reason if not data else data.strip()}
             content_type = []
             if response.headers.get("Content-Type", None):
                 content_type = response.headers.get("Content-Type", None).split(";")